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The compound that does NOT liberate CO₂ on treatment with aqueous sodium bicarbonate solution, is -

1. Benzoic acid
2. Benzensulphonic acid
3. Salicylic acid
4. Carbolic acid (Phenol)

Correct answer: Carbolic acid (Phenol)

Solution

Phenol (carbolic acid) is a weak acid and does not react with sodium bicarbonate to release CO₂, unlike stronger acids like benzoic acid or salicylic acid.

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